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implement Authenticate, Mainmodule;
include "sys.m";
sys: Sys;
include "draw.m";
include "sh.m";
include "keyring.m";
keyring: Keyring;
include "security.m";
auth: Auth;
include "alphabet/reports.m";
reports: Reports;
Report, report: import reports;
include "alphabet.m";
alphabet: Alphabet;
Value: import alphabet;
Authenticate: module {};
typesig(): string
{
return "ww-ks-Cs-v";
}
init()
{
sys = load Sys Sys->PATH;
alphabet = load Alphabet Alphabet->PATH;
reports = load Reports Reports->PATH;
keyring = load Keyring Keyring->PATH;
auth = load Auth Auth->PATH;
auth->init();
}
quit()
{
}
After, Before, Create: con 1<<iota;
run(nil: ref Draw->Context, r: ref Reports->Report, errorc: chan of string,
opts: list of (int, list of ref Alphabet->Value),
args: list of ref Alphabet->Value): ref Alphabet->Value
{
keyfile: string;
alg: string;
verbose: int;
for(; opts != nil; opts = tl opts){
case (hd opts).t0 {
'k' =>
keyfile = (hd (hd opts).t1).s().i;
if (keyfile != nil && ! (keyfile[0] == '/' || (len keyfile > 2 && keyfile[0:2] == "./")))
keyfile = "/usr/" + user() + "/keyring/" + keyfile;
'C' =>
alg = (hd (hd opts).t1).s().i;
'v' =>
verbose = 1;
}
}
if(keyfile == nil)
keyfile = "/usr/" + user() + "/keyring/default";
cert := keyring->readauthinfo(keyfile);
if (cert == nil) {
report(errorc, sys->sprint("auth: cannot read %q: %r", keyfile));
return nil;
}
w := chan of ref Sys->FD;
spawn authproc((hd args).w().i, w, cert, verbose, alg, r.start("auth"));
return ref Value.Vw(w);
}
authproc(f0, f1: chan of ref Sys->FD, cert: ref Keyring->Authinfo,
verbose: int, alg: string, errorc: chan of string)
{
fd0 := <-f0;
if(fd0 == nil){
sys->pipe(p := array[2] of ref Sys->FD);
f0 <-= p[1];
fd0 = p[0];
}else
f0 <-= nil;
eu: string;
(fd0, eu) = auth->client(alg, cert, fd0);
if(fd0 == nil){
report(errorc, "authentication failed: "+eu);
f1 <-= nil;
<-f1;
reports->quit(errorc);
}
if(verbose)
report(errorc, sys->sprint("remote user %q", eu));
f1 <-= fd0;
fd1 := <-f1;
if(fd1 == nil)
reports->quit(errorc);
wstream(fd0, fd1, errorc);
reports->quit(errorc);
}
wstream(fd0, fd1: ref Sys->FD, errorc: chan of string)
{
sync := chan[2] of int;
qc := chan of int;
spawn stream(fd0, fd1, sync, qc, errorc);
spawn stream(fd1, fd0, sync, qc, errorc);
<-qc;
kill(<-sync);
kill(<-sync);
}
stream(fd0, fd1: ref Sys->FD, sync, qc: chan of int, errorc: chan of string)
{
sync <-= sys->pctl(0, nil);
buf := array[Sys->ATOMICIO] of byte;
while((n := sys->read(fd0, buf, len buf)) > 0){
if(sys->write(fd1, buf, n) == -1){
report(errorc, sys->sprint("write error: %r"));
break;
}
}
qc <-= 1;
exit;
}
kill(pid: int)
{
sys->fprint(sys->open("#p/"+string pid+"/ctl", Sys->OWRITE), "kill");
}
exists(f: string): int
{
(ok, nil) := sys->stat(f);
return ok != -1;
}
user(): string
{
u := readfile("/dev/user");
if (u == nil)
return "nobody";
return u;
}
readfile(f: string): string
{
fd := sys->open(f, sys->OREAD);
if(fd == nil)
return nil;
buf := array[128] of byte;
n := sys->read(fd, buf, len buf);
if(n < 0)
return nil;
return string buf[0:n];
}
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